Lock with emergency unlocking mechanism

Abstract

A door locking device for a door cooperating with a door frame includes a cylinder lock, at least one elongated bolt, and an emergency unlocking mechanism. The elongated bolt is adapted to move linearly to engage to and disengage from the door frame. A transmission including an operating wheel translates circular motion of a rotor of the cylinder lock to a linear motion of the elongated bolt. The emergency unlocking mechanism includes a gear arm connected to a handle and adapted to turn the operating wheel when the handle is turned, disengaging the elongated bolt from the door frame.

1. A door locking device for a door cooperating with a door frame, comprising:
 a plurality of elongated bolts adapted to move linearly to engage and disengage the door frame; 
 a latch mechanism for engaging with the door frame, the latch mechanism including a latch member and a latch arm; 
 an operating wheel for translating circular motion to a linear motion of each of the elongated bolts, the operating wheel further including a member adapted to engage the latch arm; and 
 an unlocking mechanism including a gear arm and a lock nut mechanism connected to a handle; 
 wherein, operation of only the handle is adapted to turn the lock nut mechanism, turning the gear arm to turn the operating wheel in order to disengage the plurality of bolts from the door frame and to rotate the latch arm and disengage the latch member from the door frame. 
 
     
     
       2. The device of  claim 1 , wherein the unlocking mechanism further includes an auxiliary gear wheel affixed to the operating wheel and wherein the gear arm is adapted to rotate the operating wheel by engaging teeth of the auxiliary gear wheel. 
     
     
       3. The device of  claim 2 , wherein the auxiliary gear wheel is affixed coaxially to the operating wheel. 
     
     
       4. The device of  claim 2 , further comprising a separately actuated catch mechanism used to immobilize the operating wheel by pressing on a spring-loaded arm which engages a notch in the operating wheel, the catch mechanism released when the handle is turned. 
     
     
       5. The device of  claim 4 , wherein the catch mechanism includes an electromagnetic actuator. 
     
     
       6. The device of  claim 5 , wherein the catch mechanism is remotely controlled. 
     
     
       7. The device of  claim 2 , wherein the operation of the handle includes partially turning the handle to first disengage the latch member from the door frame and then further turning the handle to disengage the plurality of bolts from the door frame. 
     
     
       8. The device of  claim 1 , further comprising another handle for operating only the latch. 
     
     
       9. The device of  claim 1 , wherein the operating wheel is adapted to rotate in the same direction as a rotation direction of the gear arm. 
     
     
       10. The device of  claim 1 , further comprising a separately actuated catch mechanism used to immobilize the operating wheel by pressing on a spring-loaded arm which engages a notch in the operating wheel, the catch mechanism released when the handle is turned. 
     
     
       11. The device of  claim 10 , wherein the catch mechanism includes an electromagnetic actuator. 
     
     
       12. The device of  claim 11 , wherein the catch mechanism is remotely controlled. 
     
     
       13. The device of  claim 1 , wherein the handle is an inner door handle. 
     
     
       14. The device of  claim 1 , wherein the handle is a knob. 
     
     
       15. The device of  claim 1 , wherein the plurality of bolts includes 4-way bolts. 
     
     
       16. The device of  claim 15 , wherein the plurality of bolts includes seven bolts. 
     
     
       17. A method for unlocking a door set in a door frame, the door including a plurality of elongated bolts adapted to move linearly to engage and disengage the door frame, a latch mechanism for engaging with the door frame and including a latch member and a latch arm, and an operating wheel for translating circular motion to a linear motion of each of the elongated bolts, the operating wheel further including a member adapted to engage the latch arm, the method comprising steps of:
 providing an unlocking mechanism including a gear arm and a lock nut mechanism connected to a handle; and 
 using only the handle to turn the lock nut mechanism to turn the gear arm to rotate the operating wheel in order to disengage the plurality of bolts from the door frame and to rotate the latch arm and disengage the latch member from the door frame. 
 
     
     
       18. The method of  claim 17 , wherein the plurality of bolts includes 4-way bolts. 
     
     
       19. The method of  claim 18 , wherein the 4-way bolts include seven bolts. 
     
     
       20. The method of  claim 17 , wherein the step of using only the handle includes first turning the handle partially to disengage the latch member from the door frame and then further turning the handle to disengage the plurality of bolts from the door frame.